Simple monkey patch for decent_exposure's nu_nu branch to add automatic decoration of singular resources. Throw this in config/initializers and monkey patch your way to victory! Assumes a module like the one included.

decent_decorator.rb

class DecentExposure::ActiveRecord::Finder

  def decorated_singular_resource
    singular_resource.extend("#{singular_resource.class.name}Decorator".constantize)
  rescue NameError
    singular_resource
  end

  def resource
    if plural?
      collection_resource
    else
      decorated_singular_resource
    end
  end
end

user_decorator.rb

module UserDecorator
  def full_name
    [first_name, last_name].join(' ')
  end
end